中译英：专家说两年之后才能将这个理论付诸于实际.(before) 求正确句型及正解..

The experts said that it would be two years before the theory was put into practise.
涉及语法点：1.宾语从句.2.before句型.3.短语：理论付诸实践 put theory into practise.
before的两种常用用法：
1）句型It will be/was＋段时间＋before…“还要过多久才……”
如：It will be two years before he leaves the country.
2）句型It will be/was not＋一段时间＋before…“不多久就……”
如：It wasn’t two years before he left the country.